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Although you think the lens is in focus, when stopped down, I know it is not.
There are enough articles that tell about Depth Of Field, but I give a short explanation.
The DOF from a 50 mm lens on a APS-C camera, when set to f /1,4. when you focus on 1 meter, is just 2 cm when on f /4 you have a totoal of 6 cm and on f /11 it is 11cm. So wen your camera / lens combination has a back focus of about 5 cm, it will come within the 11 cm you get in f /11. Still the picture is not in focus, but you see what you want to see sharp.
I searched through the complete manual, scanned the review on Dpreview and searched the site from Richo, but noting to find about correcting back or front focus. on the K10D. Perhaps, because in the days this camera came on the market, they thought the photographer who uses f /1.4 lenses is used with manual focus.
I'm, not sure, but perhaps someone on the Richo / Pentax service centre can tell you, if they can correct the setting for your lens.

To my experience, the front or back focus is in the camera. (the six or 7 lenses I use on my camera, all have the same back focus, but my Nikon has a setting to correct that.

So if you want to use your lens without any change made to your camera, there is only one option, focus manually.

I'm thinking this is a depth of field problem. The lens iris will be opening up fully at night reducing the depth of field the set focus point will then not be in the focus range.
Possible Solutions:
Use a ND filter in front of the camera during the day and refocus the camera this will ensure you are in the focus with the lens iris fully open. The WZ16 has an IR corrected lens so you should not be seeing focus shift problems.
Focus the camera at night.
Ian Crosby
Product Marketing Manger EMEA
Bosch Security Systems
>>> For the WZ series amongst others

Could be some moisture causing the sticking. You could bury the camera in rice for a couple of days to absorb the moisture. As far as focusing on a correct subject in a close-up, you should set your auto focus on spot focussing. Then, only a tiny portion of the center of your screen is the focus point. Center the important part and press the shutter half-way to lock the focus and then you can move the camera to a better position and press the rest of the way.

We just bought this camera today for our 12 year old son. We got it home and heard the same strange sound. I showed the camera to my husband who is a professional photographer, and he said the sound you are hearing is coming from the motor. If you look at your screen when this noise is happening you will see that it only makes the sound when the camera is trying to do the auto focusing. Once the camera focuses on the image, the sound stops. He said the sound is normal, and this is the way that this camera was designed. Once I looked at the screen I could see that he was right, when the camera focused on a face, or object, the sound stopped.